DMM functions + usage with EFi & ABS

with regards the ABS activating when not required, what vehicle is it ? the reason i ask is we had a rover in with the same problem, it turned out that both front phono wheels (toothed abs rings) had slight cracks in them which made the ring open slightly under driving power.might worth a check if they have the rings.

Reg

snipped-for-privacy@hotmail.com wrote in news: snipped-for-privacy@i15g2000cwa.googlegroups.com:

Thanks for that tip reg. I'll be renewing the front discs & pads when I come to looking at it so I'll be sure to inspect the rings carefully at that time. I did the rears a short while ago, not before the problem started, and they appeared to be fine.

It seems natural to suspect a ring because one would think that a bad sensor would eventually trigger the fault lamp due to an out of range reading. The light has never come on whilst driving.

Stu

Stu

Chris Bartram wrote in news:HmSnh.26563$ snipped-for-privacy@text.news.blueyonder.co.uk:

Thanks. My reasoning was the same. I just asked the question because I'm not very familiar with sensing devices used in automotive applications. In my line of work I tend to deal with I/O devices that are based on 4-

My plan is to use the min-max function for a certain length of time whilst cruising at a steady speed. I would then hold the values recorded whilst I stopped and then look to see if I picked up a min reading drastically below the expected value at the speed I had been driving, thus suggesting an interruption in the output. At this stage, I don't know if it that will be necessary. All I know is that the problem is intermittent and does not result in a malfunction of the system.

I totally agree that it always pays to check the simple causes - they will always be a possibility. In this case, my plan is to monitor from the connector in the cabin as indicated by Autodata. This way I will pick up on any physical faults in the wiring as well as a possible bad sensor.

Stu

Copied from the Honda newsgroup.

Bob

"Bob Dodds" wrote in news:2G0oh.34654$ snipped-for-privacy@newsfe4-win.ntli.net:

Some good information in there. Thanks, Bob.

Stu

My Volvo 940 used to do this. It was because the castleated (sp?) discs for the ABS on the front hubs which generated the ABS pulses were corroded. Cleaning them with a wire brush helped for a while, but eventually they needed to be replaced.

Alan.

"Alan" wrote in news:%2roh.54889$ snipped-for-privacy@newsfe1-gui.ntli.net:

Thanks, Alan. Reg has already pointed at a possible sensor ring problem so I'll be giving them a good clean & inspection when I change the discs & pads in the next few weeks. I'm hoping that this will be the cause because it would save me from having to fart about with a meter, plus the rings are probably (I think) the cheapest parts in the system.

Stu